1. When a value of a variable should be true?
Ans: The value of a variable should be true when it’s a natural number for a number type variable, any string with a letter sign, or with space.
Here some examples when the value should true:
1. When the variable should define by true.
2. When the variable is number type and its value is natural number without 0.
3. If the variable is a string type and the value is not an empty string. If I was given a space in “ ” it’s true.
4. If the value is not undefined.
5. If the value is not null.
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React is a JavaScript library created by Facebook. It is a User Interface(UI).
So now, I write 10 important things that you should interest to know.
1. It’s not a framework
React is just a library and it can’t decide without you. But it helps you to use his component and build the user interface. It has some weaknesses that it doesn’t create server communication, can’t translate, can’t routing, and many others.
2. JSX
JSX full meaning is JavaScript XML. When you write your code in react you already notice that JSX in action already. …
Here I point out some important things from javascript that every javascript developer must know.
- Error Handling
- Primitive Values
- Objects and Functions
- Expressions
- Checking a Type
- Types of values
- Coding Style
- Comments
Error Handling
Here you are a great programmer, but sometimes our scripts have some errors. It happen when I made mistake, a wrong user input, or the server not responding. Generally, a script immediately stops for an error, printing it to the console. But we use try-catch syntax to catch the error.
The “try-catch” syntax:
JavaScript is a high-level programming language that is multi-paradigm, dynamic with types and operators, standard built-in objects, and methods. Its syntax is based on C language and Java. JavaScript support object-oriented programming with object prototype.
JavaScript types are:
o Number
o String
o Boolean
o Object
· Function
· Array
· Date
· RegExp
o Symbol
o Undefine
o Null
In JavaScript, there are some built-in error types.
Variables
In JavaScript, there are used let, const, and var to declared variables.
let allow us to declare block-level variables and the value of the declared variable can be changed.
JavaScript is a high-level programming language. We can simply use this language because we don’t need to have a knowledge about machine learning. Example: If we want to use C, C++ we must know about how machine work, how a compiler does his job, how to run, how much memory uses. But we don’t need to think about this when we programmed with high Level Language as like JavaScript.
For a web developer JavaScript is essential. Past days when we could get by little HTML and CSS. But fortunately, it has some rules to dead it simple to get start:
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